Nashville winters are genuine — temperatures regularly dip below 30°F, and ice storms hit every few years with enough severity to cause widespread heating system demand spikes. Most Nashville homes use gas forced-air furnaces or dual-fuel systems. A furnace failure during a Nashville cold snap or ice storm requires prompt response. Licensed furnace repair contractors in Nashville diagnose heat exchanger cracks, igniter failures, gas valve problems, and control board faults. Tennessee requires HVAC contractors to hold a D-37 license. Furnace repairs run $150–$400; replacement averages $2,500–$6,000. Contractors here serve Nashville and the metro including Brentwood, Franklin, Murfreesboro, Hendersonville, and Clarksville.